By Christine Williamson, includes “Investment returns of the $54.2 billion Illinois Teachers' Retirement System, Springfield, met or trailed its benchmark as of Dec. 31 in several time periods. … Annualized returns over longer periods ended Dec. 31 were: three years, 8.6% (benchmark, 9.5%) … 15 years, 6.6% (7%) …” (Note: for a list of investment managers and fees for TRS, see pages 84-87 of the TRS annual report here.)